Grinding-machine



E. B. GARDNER.

GRINDING MACHINE.

APPLICATION FILED MAY I9. 1919.

Patented Apr. 2Q, 19%..

'Il PIIIIIII il UNITED STATES PATENT OFFICE.

EDWARD B. GARDNER, OF BELOIT, VJISCONSIN, ASSIGNOR TO BADGER TOOL COMPANY, OF BELOIT, WISCONSIN, A CORPORATION OF /'ISCONSIN.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Apr. 20, 1920.

Application filed May 19, 1919. Serial No. 298,170.

To @ZZ whom t may concern.' y

Be it known that I,- Enwnnn B. Gif-innNnu, a citizen of the United States, residing at Beloit, in the county of Bock and State of Wisconsin, have invented certain new and useful improvements in Grinding-Machines, of which the following` is a specification.

My invention relates to grinding machines and more especially to an improved mounting for the work tables of grinding` machines. In the common type of disk or ring grinding machines, a column carries a grinding wheel on a spindle suitably mounted near the top of the column. A circular shaft is mounted in bearings in the column and extends outwardly below the grinding wheel. Beyond the grinding wheel the work table is adjustably mounted on this projecting shaft.

This type of construction has two outstanding disadvantages. First, that the overhanging mounting for the work table allows excessive vibration even when the parts are made very heavv, and second, that precise alinement between the spindle and the shaft carrying the work table is usually obtained if at all by bending or peening the shaft carrying the work table into alinement.

One object of my invention is to eliminate vibration by providingtwo bearings for the rocker shaft located adjacent the rocker box on either side thereof.

Another object is to provide for adjustnient of the work table toward and away from the grinding wheel by moving a table carrying these bearings.

Another object is to provide for adjustment of the rocker shaft into exact alinement with the spindle in assembling the machine or at any time during the use of it.

Another object of the invention is to provide means for an angular adjustment between the positions of the work table and the counter-weight usually used to hold the work table upright.

A. special object is to provide an improved means for guarding the bearings of the movable parts of the machine from dust.

tion thereto. Fig. 2 is an end view of the same machine, and Fig. 3 is an enlarged fragmental section showing the construction of the dust guard.

ln the embodiment of my invention selected for illustration, a vertical column 10 carries a'spin dle l1 in suitable bearings 12 at its upper end. A `grinding wheel 13 may be mounted at each end of the spindle 11 which receives power from a suitable belt passing over a pulley 1i at its center. 1n the (1l-.raw-

'ings only one grinding wheel 13 and the work table and mounting associated with it have been illustrated as it is customary in machines of this type to provide the opposite ends of single machine with iittings of different types if desired. work table 15 is carried in front of the grinding wheel 121 being slidably mounted on a base 16 having an integral lug` 1T pivotally mounted for clamping adjustment on a vertical bar 18. The vertical bar 18 may be clamped in vertically adjusted position by screws 19 in a rocker box 20. lever 21 controls the sliding motion of the table 15 on the base 16 by any suitable mechanism, not shown. As the elements above enumerated in the relationship described are all old in the art and form no part of my present invention, further detailed description thereof is considered unnecessary.

For the support of the work table a projecting knee 22 is formed as an integral part of the column i() and has two outwardly proecting lips 23 and 24 machined to constitute guideways for a slidable carriage 25. The slidablc carriage is retained on the ways by suitable retaining flanges 26 and its alinement on the ways can be precisely adjusted by means of an adjusting gib 2T controlled by a series of adjusting screws 28 threaded through the adjacent depending flange of the table and` locked in adjusted position by suitable lock nuts 2f). Convenient `and quick sliding adjustment of th carriage 25 on the ways for shifting the work table toward and away from the grinding wheel to accommodate pieces of work of different size may be accomplished by a locking gib 30 located opposite the adj listing gib and forced into clamping engagement with the way 24 by suitable locking screws 31,

The carriage 9.5 carries bearings P19 and through which passes the rocker shaft J'l-i. The rocker box 20 embraces the rocker shaft throughout the entire length betwen the tivo bearings 32 and and is at all times rigidly clamped thereto by suitable locking screws 35 engaging lugs 3G in the split sleeve forming a part of said rockerbox. fhe carriage 25 is cut away as indicated in dotted lines at 37 under the vertical arm 18 to alloiv adjustment thereof, and the upper surface of the knee 22 is cast with a down- Ward curve, as indicated in dotted lines at 38 in F ig. 2 to provide a proper clearance for the downwardly projecting end of the vertical arm 1S.

To hold the Wort: table l5 in upright position in front of the grinding Wheel 18 a counteriveight 39 is fastened at the end of a projecting arm 4L() at the outermost end of the rocker shaft 34. 'I he counteriveight 39 receives the rod l() in telescopic engagement in a suitable hole il and the moment of the Weight around the rocker shaft 34 may be varied by adjusting the Weight toward and l away from the rocker shaft and clamping it in adjusted position with a suitable set screw 42. Means are provided for adjusting the relative angular positions of the Work table around the rocker shaft 3st comprising a split collar f3 integrally united to the end of the rod and embracing said rocker shaft for clamping engagen'lent therewith. Under the strains and vibrations of actual service it has been found impracticable to restrain the rocker shaft 84 against longitudinal play by engagement between .the machined abutting surfaces of the bearings 32 and 33 and the rocker box. Such restraint being incapable of conif'enient adjustment, the looseness resulting from wear soon renders it ineffective. According to my invention the rocker shaft is restrained from end play by engagement between the surfaces of the outer bearing 33 and the adjacent surfaces of the rocker box and the split collar 43. As the split collar L3 is readily adjustable any looseness due to Wear can be readily taken up. This collar 48 therefore performs two independent and essential. functions, first, it carries the counteriveight 89 and permits angular adjustment of said counter- Weight, and second, it adjustably clamps the rocker shaft 34 against end play.

The bearings 32 and 33, the sleeve of the rocker shaft 20 and the collar #lf3 are all of the same outside diameter. Suitable guards to prevent dust, grit, etc., from working in around the rocher shaft 3ft and damaging the bearing surfaces, comprise a ring elli (see Fig. 8) suitably attached to one member and overlying the other, and a second ring 45 fitting closely on the second member and fastened thereto, and enlarged at 46 to overlie the rst ring 44:. In Fig-B the dust guard at the end of the rocker box nearest the Wheel is shown and both rings abut the shoulder 47 on the rocker box.

It will be seen that I have provided a relatively simple and very rigid mounting for the Work table accomplishing completely the objects in View.

While I have disclosed in detail the embodiment of my invention at present preferred, it should be clearly understood tha such disclosure is only illustrative and that many modifications and improvements ivill naturally occur to a skilled Workman, I aim in the subjoined claims to cover all such legitimate modifications and improvements.

I claim as my invention:

l. In a machine of the class described, in combination, a body, an operating element, a Work-table, a rotatable shaft carrying said Work-table, and bearings carrying said rotatable shaft, said bearings being movable toward and aivay from the vertical plane of' said operating clement.

2.' In a machine of the class described, a body, an operating ele-ment carried by said body, a Work-table, a rotatable shaft carrying said ivorletable, and integrally connected bearings carrying said rotatable shaft, said bearings being slidable toward and away from the vertical plane of said operating element.

3. In a machine of the classdescribed, a body, an operating element carried on said body, a Work-table, and arctatable shaft carrying said Work-table, said rotatable shaft being slidably mounted for motion toivard and away from the vertical plane of said operating element.

el. In a machine of the class described, a body, a rotating operating clement carried by said body, a rotatable Work-table, and means for adjusting the axis of rotation of said Work-table into exact parallelism with the axis of said operating element.

`5. In a machine of the class described, a body, an operating element rotatable on horizontal axis carried b v said body, a Work-table rotatable on a horizontal axis, and means for rotating the horizont-al axis of said Work-table around a vertical axis into a vertical plane exactly parallel to the axis of said operating element.

6. In a machine of the class described, a work-table, a rotatable shaft carrying said work-table, bearings for said rotatable shaft located on either side of said Worletable, and a counter Weight attached to said shaft at a point laterally removed from said Work-table and bearings.

7. In a machine of the class described, in combination, a Work-table, a horizontal pivoted axle carrying said Work-table, a counter weight carried by said axle, and means for adjusting the relative angular positions of said Worletable and said counter Weight around said axle.

8. In a machine of the class described, a work-table pivoted on a horizontal axis, a

lllll llO counter weight pivoted around the same horizontal aXis, means for adjusting the relative angular positions of said work-table and said counter weight around said aXis and for clamping them in adjusted position for simultaneous rotation around said axis.

9. In a machine of the class described, in combination, a bearing, a shaft rotatable in said bearing, a member clamped to said shaft and having a face abutting one end of said bearing, a collar having a face adapted to abut the opposite end of said bearing and restrain said shaft from end play, said collar carrying a counter weight.

10. In a device of the class described, two rotatable elements having abutting cylindrical portions and a dust guard for the joint between said elements comprising an annular member attached to one of said elements and overlying the other of said elements, and a second annular member attached to the other of said elements and overlying said first annular member.

11. In a device of the class described, two rotatable members having abutting cylindrical portions, one of said members having a shoulder, and a dust guard for the joint between said members comprising an annular member attached to the shouldered member and overlying the other member, and a second annular member attached to the other member and overlying said first member and extending to said shoulder.

12. A machine of the character described having, in combination, a column, a knee projecting from said column, a carriage on said knee, bearings on said carriage, a rocker shaft in said bearings and a Worktable carried by said rocker shaft.

13. In a machine of the class described, in. combination, a column, a knee projecting from said column, guides on said knee, a carriage mounted on said guides, and means for adjusting the alinement between said carriage and said guides.

14. In a machine of the class described, in combination, a column, a knee projecting from said column, guides on said knee, a carriage slidable on said guides, and means in the nature of an adjustable gib for varying the alinement between said table and said guides.

15. A machine of the character described, comprising a body, an operating element thereon and work-supporting means comprising a base mounted on said body to slide toward and away from the operating element, and a work table mounted on said base to rock along the face of said element, said work table being provided with a connterweight to normally hold it in operative relation to said element.

16. A grinding machine comprising in combination a machine body, a grinding wheel, and a work-supporting means comprising a base portion mounted on guide ways on said body to slide toward and away from said grinding wheel, a work table mounted on said base portion to rock on a horizontal axis running parallel to the axis of said wheel, and a counterweighted arm fixed in relation to said work table portion and arranged to hold the latter in operative relation to said grinding wheel.

17. A grinding machine comprising in combination a body, a grinding wheel, said body having guide ways located beneath the plane of said wheel and running parallel to the axis of the wheel, and work-supporting means comprising a base portion having guides to cooperate with said guide ways on the bed whereby the work support may slide toward and away from the grinding wheel, the said work-supporting means further comprising a work table mounted upon said base to rock on a horizontal axis running parallel to the axis of the grinding wheel and being counteiwveighted to be normally maintained in operative relation to the face of the grinding wheel.

18. In a machine of the class described, the combination of a body, an operating element` a pair of bearings, a shaft rotatable in said bearings, a work table Afixed to said shaft between said bearings, and means whereby said bearings may be adjusted relatively to said body.

19. In a machine of the class described, the combination of a body, a pair of rigidly connected bearings, a shaft rotatable therein, a work table mounted on said shaft, and means whereby said bearings may be adjusted longitudinally of and transversely with respect to the axis of said shaft.

20. In a machine of the class described, the combination of a body, a work table, a rotatable shaft by which said table is carried, a plurality of bearings arranged in spaced relation on said body to support said shaft on each side of said table, and means whereby the position of said bearings may be adjusted to vary the position of said table with respect to the body.

21. In a machine of the class described, the combination of a body, a pair of rigidly connected bearings arranged in spaced relation on said body, a shaft journaled in said bearings, a table fixed to said shaft between said bearings, and means for adjusting` the position of said bearings.

In testimony whereof, I have hereunto set my hand.

EDIVARD B. GARDNER. 

